PATCH: Fix dlfcn.h for C++.

[Ulrich Drepper]

"H . J . Lu" <hjl@lucon.org> writes:

> This patch fixes dlfcn.h for C++.

Exaggerated as usual.  Only little thing is effected.  If one day
something is really badly broken I'll not look at it because I cannot
filter the report out of the stream.

Anyhow, I've fixed it slightly differently.  Directly doing what is
necessary is much better.  Thanks,

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